:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #333;
    --bg-color: #f4f6f7;
    --card-bg: #fff;
    --error-color: #e74c3c;
    --success-color: #27ae60;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 800px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 40px;
    position: relative;
}

h1,
h2 {
    color: var(--primary-color);
    margin-top: 0;
}

button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 20px;
}

button:hover {
    background-color: #2980b9;
}

button:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-top: 10px;
}

.choice {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 15px;
    cursor: pointer;
    transition: all 0.2s;
}

.choice:hover {
    background-color: #f8f9fa;
    border-color: var(--accent-color);
}

.choice.selected {
    background-color: #e8f4fc;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-color);
}

.warning {
    background-color: #fef9e7;
    border-left: 4px solid #f1c40f;
    padding: 15px;
    margin-bottom: 20px;
}

.note {
    background-color: #e8f4fc;
    border-left: 4px solid var(--accent-color);
    padding: 15px;
    margin-top: 20px;
    font-style: italic;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    border-radius: 8px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Error Message */
.error-message {
    background-color: #fce4e4;
    border-left: 4px solid var(--error-color);
    color: var(--error-color);
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}